The DEWALT DCM849 XR Cordless Rotary Polisher has a brushless motor for increased performance and run time. It has a variable speed trigger and dial for better control during car, headlight, windshield and glass polishing applications. The rubber gear case overmould reduces surface imperfections and improves gripping surface. It can also be held via the front grip or side handle. DCM849P2: 2 x 18V 5.0Ah Li-ion Batteries.DCM849N: Bare Unit, No Battery or Charger. Specifications: Oscillating Speed: 800-2,200/min.Backing Plate: 180mm.Spindle Thread: 15.9mm.